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《Automation of Electric Power Systems》 2017-24
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Optimization and Improvement Strategy for Direct Current 50Hz Protection Using Waveform Recognition

LI Xiaohua;WU Jiaqi;DING Xiaobing;WU Lizhu;ZHANG Dongyi;CAI Zexiang;School of Electric Power,South China University of Technology;Maintenance Company of State Grid Hubei Electric Power Company;Power Dispatching and Communication Center of China Southern Power Grid Co.Ltd.;  
Combined with direct current(DC)50 Hz protection action events caused by transformer inrush current occurred in China southern power grid in recent years,the waveform characteristics difference of inrush current,sympathetic inrush current and fault current are simulated and studied.Under the principle of without reducing sensitivity of the protection,an optimization and improvement strategy for DC 50 Hz protection based on waveform recognition is proposed.A DC 50 Hz protection lockout model is designed and developed in the PSCAD/EMTDC control and protection simulation model based on the optimization and improvement strategy.The proposed strategy is verified by means of simulation from the change of the alternating current system strength,no-load closing angle of converter transformer and core remanence of converter transformer.The results show that the proposed strategy can realize the blocking and unlocking of DC 50 Hz protection correctly,which solves the misoperation problem of DC 50 Hz protection caused by inrush current of the transformer without affecting the safety and stability of the DC system,and it has some reference significance to the research work and protection design.
【Fund】: 国家自然科学基金资助项目(51677073)~~
【CateGory Index】: TM774
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